Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is are true about slaking of lime and the solution formed?
(i) It is an endothermic reaction.
(ii) It is exothermic reation.
(iii) The pH of the resulting solution will be more than seven.
(iv) The pH of the resulting solution will be less than seven.

Options

A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iv)
D. (iii) and (iv)

Answer

b

Explanation

`CaO +H_(2)O to Ca(OH)_(2)+` Heat
Slaking of lime is an exothermic reaction because heat is given out and the resulting compound is calcium hydroxide which is basic in nature so, the pH of the resulting solution will be more than 7. `Ca(OH)_(2)` turns red litmus solution to blue. So, its PH value is greater than 7.